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Vivek Sharma spends a lot of time thinking about email. His company, Movable Ink, lets users show dynamic content in their emails that can change even after a message is sent.

Imagine your email signature always showing your most recent Twitter update. Or for the more commercially-minded, imagine embedding an ad into an email that changes depending on where the recipient is located. These previously unheard of applications are Movable Ink's bread and butter.

We got in touch with Sharma to ask him about his favorite email apps -- here's what he had to say.